Engine-driven pump



l... HATHAWAY 2,309,505 I ENGINE DRIVEN PUMP Filed Dec. 1, 1941 Juli. 26, 19.43.

- Y inamzzr' Zawrarwe Ial/mway engine, for priming purposes.

Patented Jan. 26, 1943 2,309,505 I ENGINE -DRIVEN PUMP Lawrence Hathaway,

Mr OFFICE 1 Coventry, England, assignor :to CoventryClimax Engines Limited, Coventry, 'Warwickshire,-. England Application December 1, 1941, Serial No. 421,215

In Great Britain August 6-Claims. (Cl. 103- 23) Our main object-is to provide improvedimeans for the'priming'of an engine-driven pump, particularly -a centrifugal type :of pump, and particularly in the case of aipumpingunit'using an engine of relatively-low'power.

priming can be effected'by-an exhaust iejector action, but'this is -not satisfactory when the engine is of relatively-low power.

The invention consists-in'the combination with an engine-driven pump, of a reciprocating type of priming pump 'which is mounted so as to be by'an engine=drivencamin the 'form of an eccen- "tric, beingspring-pressed' towards the inoperativeposition-sothat -ithas to be held in the operative position during priming.

In the accompanying sheet of drawings- Figure 1 is a side elevation of a pumping unit provided with priming means according to the invention, though the actual priming pump is omitted;

Figure 2 is an end elevation of the priming means of Figure 1, showing the priming pump;

Figure 3 is a part-sectional side elevation showing parts of Figure l to a larger scale;

Figure 4 is a perspective View, to a still larger scale, mainly of the eccentric; and

Figure 5 is a perspective view, to a smaller scale, of the supporting base of the unit.

In the construction illustrated, there is a unit incorporating a small internal-combustion engine ll of, say, 1 H. P., adapted to have its crankshaft I2 coupled, preferably through a flexible coupling l3, with the shaft I 4 of a centrifugal pump l5. The unit is mounted on a base plate I! which is in turn mounted upon a tubular cradle [8 formed of two longitudinals terminating at their ends with upwardly-raised loops I 9. The loops can be gripped when the unit is to be transported and the longitudinals serve as runners if it is to be slid along the ground.

The priming pump, indicated at 22, is conveniently disposed between the engine and the centrifugal pump, the driving cam, in the form of an eccentric 23, being either on the crankshaft or preferably on the pump shaft as illustrated. In a preferred arrangement, as shown by Figures 2, 3 and 4, the eccentric 23 is encased in an oil-retaining bush 24 which is secured For apumping- .umt having an engine "of relatively-high power v gainst axial movement-thereon in any convenient way, as. bymeans of-circlips 25;th-eX- ternal surface of the bush being 'adaptedtoengage the lever arm 26 of-the priming pump." The eccentric is keyed'ion the pump shaft l41andendwise located between'the drivenfiange -21: ;of'-the coupling 13 and aspacer 28, the-latter engaging at its other end the adjacent 'end of a" support 2 9 for a bearing for the pump shaft 1-4. v

The priming pump is preferably a -diaphra gmtype of pump of a known form,' having aflange 3! which is bolted or otherwise-'secured-against a 'correspondingflange 32*on a hand-lever 33 pivotally-mounted at -34*up on-a bracket -3 5 which is in turn supported from some1 p art of 'the unit, for example; the base plate thereof or"the" cen trifugal pump itself. 'Inthepresent-instancethe lever. arm 26 of the priming pump extends through slots 31;;provided inthe said flanges. The hand-lever 33 is formed with anoutturned toe 38 working in a slot 39 in the bracket 35. A spring means, here shown as a tension spring 4 l, is provided to bias the hand-lever and priming pump as a whole to carry the lever arm 26 away from the eccentric, the toe 38 then engaging one end of the slot 39 to provide a stop. An adjustable screw 42 co-operates with the other end of the slot to provide a stop in the other direction, when the hand-lever is pulled to carry the lever arm 26 into contact with the eccentric against the bias of the spring, as is shown in Figure 2. I

The priming pump is preferably enclosed by a cowling, as shown at 43, the latter having an opening 44 through which the hand-lever 33 extends. The inlet side of the centrifugal pump is provided at some convenient place (45) with a nipple which is connected by a connection (not shown), including a flexible portion, leading to the inlet side of the priming pump. The outlet side of the latter is connected by a pipe (also not shown) running to waste.

When the centrifugal pump is to be used, the engine is first started up, a main valve 46, controlling the outlet 47 of the centrifugal pump, is closed, and the hand-lever 33 is then pulled to carry the priming pump to the operative position. The hand-lever is held in this position until priming is elfected, which will be evidenced by the delivery of water (or whatever material is being pumped) from the outlet pipe of the priming pump. Thereupon the hand-lever 33 is released and the main valve 35 of the centrifugal pump can be opened.

the cam to move the lever about What I claim as my invention and desire to secure by Letters Patent of the United States is:

1. In a device of the character described, a driving shaft, a cam operated by said shaft, a reciprocating type pump, posed in proximity to said cam and secured to said pump, a pivoted lever having one end operatively connected to the reciprocating element of said pump and its other end extending toward said cam, and means to bring the lever into operative engagement with the cam to move the lever about its pivot and operate said pump.

2. In a device of the character described, a driving shaft, a cam operated by said shaft, a reciprocating type pump, a support movably disposed in proximity to said cam and secured to said pump, a pivoted lever having one end operatively connected to the reciprocating element of said pump and its other end extending toward said cam, and means to move said support to bring the lever into operative engagement with its pivot and operate said pump, and means biasing said support and lever to their inoperative positions in which the lever is out of contact with said cam.

3. In a device of the character described, a driving shaft, a cam operatively secured to said shaft, a support movably disposed adjacent said cam, a diaphragm-type pump secured to said support and movable therewith, a movable lever operatively connected at one end to the diaphragm of the pump, and having its other end extending towards the cam, and means to move said support to-bring the lever into operative engagement with the cam so'that operation of said cam acts through said lever to operate the pump diaphragm. V

4. In a device of the character described, a driving shaft, a cam operatively secured to said a support movably dismove said support to I shaft, a support movably disposed adjacent said cam, a diaphragm-type pump secured to said support and movable therewith, a movable lever operatively connected at one end to the diaphragm of the pump, and having its other end extending towards the cam, and. means to move said support to bring the lever into operative engagement with the cam so that operation of said cam acts through said lever to operate the pump'diaphragm, and means biasing said support and lever to their inoperative positions in which the lever is out of contact with the cam.

5. In a priming mechanism for use with a centrifugal pump, a drive shaft, a cam operated by said shaft, a base, a supporting arm pivoted to said base, a reciprocating-type priming pump carried by said supporting arm, a lever operatively connected at one end to the reciprocating element of said priming pump to operate said pump and having its other end extending toward said cam, and means to move the supporting arm about its pivot to bring the lever into operative engagement with the cam to operate the priming pump through the lever.

6. In a priming mechanism for use with a centrifugal pump, a drive shaft, a cam operated by said shaft, a base, a supporting arm pivoted to said base, a reciprocating-type priming pump carried by said supporting arm, a lever operatively connected at one end to the reciprocating element of said priming pump to operate said pump and having its other end extending toward said cam, and means to move the supporting arm about its pivot to bring the lever into operative engagement with the cam to operate the priming pump through the lever, said base having stop means to limit the movement of the supporting arm about its pivot, and means biasing the supporting arm to its inoperative position.

LAWRENCE HATHAWAY. 

